Engine swap and ECU?

Hi all,
As you may know following my earlier postings I'm swapping engines between my two Discovery's. Todays questions are based on the ecu. I'm swapping the ECUs keeping the relevant one belonging to each engine ( so that I don't have to recode for the injectors avoiding disturbing the rocker cover). Now first question is this: will I be taking the other settings with the ECU, such as the EKA code number and the key fob code? I've got the Lynx diagnostic interface so any resetting should be a problem.
Again any advice I'd be very grateful to receive.

You'll have only to make the ECU learn the security code of the BCU cos there are the security settings so by swapping engines the EKA will not be affecter on that vehicle... after yoiu swapped the ECUs plug in and the tester, there must be an option in the engine management menu of Lynx with something like 'Immobiliser - learn security code"